[vtkusers] Remove polygonal props, leave volume intact

[Dženan Zukić]

Hi all,

I want to remove (and delete to free the memory) all polygonal actors, but
leaving the volume in the scene. This is my attempt:

void MainWindow::on_actionClear_polygonal_data_activated()
{
    vtkPropCollection
*props=vis->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->GetViewProps();
    for (int i=props->GetNumberOfItems()-1; i>=0; i--)
        if (!props[i].IsTypeOf("vtkVolume")) //vtkObjectBase both volume and
polyogonal
            props->RemoveItem(i);
    vis->GetRenderWindow()->Render();
}

However this also removes the volume. I have a feeling the problem is in
some small detail. Do you have any suggestions?

Regards,
Dženan
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